What causes illness is not exposure but vulnerability. Each of us are exposed to perhaps hundreds of illnesses a day, particularly if we include allergens that most of us respond appropriately to.
Intelligent policy should focus on decreasing vulnerability for most and reducing exposure only for those who already have short circuited immune systems for some reason.
And logically, long term mass reduced exposure leads to overall increased vulnerability across the population, whose immune systems are likely to learn to deal less well with ALL infectious diseases over time, making control measures self reinforcing.
Ya think that may be the GOAL? To make us all sick, or afraid of being sick? I think that.